Geotech Report Reference Document OPW19-0239 · OPW19/0239

Gympie Terrace Noosaville Pty Ltd




                                                     Approximate Site Location




Image 3: Extract from ASS Map.

  5.2 Subsurface Conditions
The subsurface conditions encountered in the boreholes generally comprised the following:

        TOPSOIL: comprising loose to dense silty sand and ranging between 100 mm to 200 mm thick,
         overlying
        ALLUVIAL SOILS: generally comprising loose to medium dense, grading to dense and very dense,
         sands to between 5 m and 6.1 m depth; underlain by medium to high plasticity, firm to stiff, clay and
         silty/sandy clay materials, underlain by
        RESIDUAL SOILS: comprising stiff to very stiff, medium plasticity, silty sandy clay from depths of
         between 7.5 m and 8.5 m (RL -5.73 m and RL -6.8 m AHD).

  5.3 Groundwater
Groundwater inflow was encountered in all boreholes during our investigation. Table 2 summarises the
groundwater conditions encountered.
Table 2: Summary of Groundwater Conditions (14 November 2018)

  Borehole Location       Groundwater Depth m BGL (~RL m AHD)

           BH1                             1.5 (0.27)
           BH2                             1.2 (0.55)
           BH3                             1.5 (0.20)
           BH4                             1.5 (0.17)

Groundwater in the standpipe in borehole BH1 was measured at 2 m BGL (RL -0.23 m) on 14 November
2018.
Given the sites close proximity to the Noosa River, groundwater levels will likely vary with tidal influence and
prevailing weather conditions. Previous experience in the area indicates that the groundwater level can rise
close to the ground surface following periods of heavy or prolonged rainfall.




J000799-002-R-Rev0                                                                                   Page 4